<header ui-dragdrop:desktop>
    <h2>
        Npm Download
    </h2>
    <div class="win-btns">
        <button class="close" ui-on:click.stop="$closeView">关闭</button>
    </div>
</header>
<canvas ref="mycanvas">非常抱歉，您的浏览器不支持canvas!</canvas>